Head on over to Chicco.com where they are offering up this highly rated KidFit 2-In-1 Belt Positioning Booster Car Seat in Amethyst (the color pictured below) for just $69.99 when you head to checkout (regularly $99.99). Note that shipping is $10 but this still seems like a great deal considering other stores such as Buy Buy Baby have this priced at $99.99.
This seat includes two cupholders and the backrest is removable for use as a backless booster seat. Safely seats children weighing 30-100 lbs. as a high back booster and 40-110 lbs. as a backless booster.